1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
|
/*
* Copyright 2003-2017 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/**
* single bz2 archive handling (requires libbz2)
*/
#include "config.h"
#include "Bzip2ArchivePlugin.hxx"
#include "../ArchivePlugin.hxx"
#include "../ArchiveFile.hxx"
#include "../ArchiveVisitor.hxx"
#include "input/InputStream.hxx"
#include "input/LocalOpen.hxx"
#include "thread/Cond.hxx"
#include "fs/Path.hxx"
#include <bzlib.h>
#include <stdexcept>
class Bzip2ArchiveFile final : public ArchiveFile {
std::string name;
std::shared_ptr<InputStream> istream;
public:
Bzip2ArchiveFile(Path path, InputStreamPtr &&_is)
:name(path.GetBase().c_str()),
istream(std::move(_is)) {
// remove .bz2 suffix
const size_t len = name.length();
if (len > 4)
name.erase(len - 4);
}
virtual void Visit(ArchiveVisitor &visitor) override {
visitor.VisitArchiveEntry(name.c_str());
}
InputStreamPtr OpenStream(const char *path,
Mutex &mutex, Cond &cond) override;
};
class Bzip2InputStream final : public InputStream {
std::shared_ptr<InputStream> input;
bool eof = false;
bz_stream bzstream;
char buffer[5000];
public:
Bzip2InputStream(const std::shared_ptr<InputStream> &_input,
const char *uri,
Mutex &mutex, Cond &cond);
~Bzip2InputStream();
/* virtual methods from InputStream */
bool IsEOF() noexcept override;
size_t Read(void *ptr, size_t size) override;
private:
void Open();
bool FillBuffer();
};
/* single archive handling allocation helpers */
inline void
Bzip2InputStream::Open()
{
bzstream.bzalloc = nullptr;
bzstream.bzfree = nullptr;
bzstream.opaque = nullptr;
bzstream.next_in = (char *)buffer;
bzstream.avail_in = 0;
int ret = BZ2_bzDecompressInit(&bzstream, 0, 0);
if (ret != BZ_OK)
throw std::runtime_error("BZ2_bzDecompressInit() has failed");
SetReady();
}
/* archive open && listing routine */
static ArchiveFile *
bz2_open(Path pathname)
{
static Mutex mutex;
static Cond cond;
auto is = OpenLocalInputStream(pathname, mutex, cond);
return new Bzip2ArchiveFile(pathname, std::move(is));
}
/* single archive handling */
Bzip2InputStream::Bzip2InputStream(const std::shared_ptr<InputStream> &_input,
const char *_uri,
Mutex &_mutex, Cond &_cond)
:InputStream(_uri, _mutex, _cond),
input(_input)
{
Open();
}
Bzip2InputStream::~Bzip2InputStream()
{
BZ2_bzDecompressEnd(&bzstream);
}
InputStreamPtr
Bzip2ArchiveFile::OpenStream(const char *path,
Mutex &mutex, Cond &cond)
{
return std::make_unique<Bzip2InputStream>(istream, path, mutex, cond);
}
inline bool
Bzip2InputStream::FillBuffer()
{
if (bzstream.avail_in > 0)
return true;
size_t count = input->LockRead(buffer, sizeof(buffer));
if (count == 0)
return false;
bzstream.next_in = buffer;
bzstream.avail_in = count;
return true;
}
size_t
Bzip2InputStream::Read(void *ptr, size_t length)
{
const ScopeUnlock unlock(mutex);
int bz_result;
size_t nbytes = 0;
if (eof)
return 0;
bzstream.next_out = (char *)ptr;
bzstream.avail_out = length;
do {
if (!FillBuffer())
return 0;
bz_result = BZ2_bzDecompress(&bzstream);
if (bz_result == BZ_STREAM_END) {
eof = true;
break;
}
if (bz_result != BZ_OK)
throw std::runtime_error("BZ2_bzDecompress() has failed");
} while (bzstream.avail_out == length);
nbytes = length - bzstream.avail_out;
offset += nbytes;
return nbytes;
}
bool
Bzip2InputStream::IsEOF() noexcept
{
return eof;
}
/* exported structures */
static const char *const bz2_extensions[] = {
"bz2",
nullptr
};
const ArchivePlugin bz2_archive_plugin = {
"bz2",
nullptr,
nullptr,
bz2_open,
bz2_extensions,
};
|
